Anti-friction mechanism of in-situ synthesized MoS2/TiO2 composite coating
The wear reduction mechanism of in-situ synthesized MoS2/TiO2 composite coating by studying the interaction between the friction interface of the MoS2/TiO2 composite coating and the diamond grinding ball,and the interfacial dislocation changes during the friction process were revealed.The results show that the in-situ synthesized MoS2/TiO2 composite coating disperses and accumulates abrasive atoms on the coating surface during the molecular dynamics simulation of friction process,which reduces the tangential stress on the coating and disperses the stress on the coating to alleviate the stress concentration at the abrasion marks.MoS2-S10%coating has the least atomic buildup,the coefficient of friction is stable at about 0.2,and it has good wear reduction performance,due to the formation of a layer of MoS2 lubrication coating on the surface of the coating during friction,and after the coating is damaged,the lower layer of MoS2 gradually migrates upward to repair the coating,so that the coating maintains a low coefficient of friction.At the same time,the in-situ synthesized MoS2/TiO2 interface is a noncoherent interface,which can annihilate the dislocations to reduce the density of dislocations and promote the movement of interfacial dislocations,thus improving the wear-reducing performance of the coating.
MoS2/TiO2 composite coatingsulfur source concentrationfriction and wearmolecular dynamicsdislocation
NETL
NSTL
万方数据
